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Differences in the rotational effect of buoyancy and trunk kinematics between front crawl and backstroke swimming.

Gonjo, T., Fernandes, R.J., Vilas-Boas, .J.P. and Sanders, R., 2021. Differences in the rotational effect of buoyancy and trunk kinematics between front crawl and backstroke swimming. Sports Biomechanics, 1 - 12. (In Press)

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DOI: 10.1080/14763141.2021.1921835

Abstract

The purpose of the present study is to investigate differences between front crawl and backstroke swimming in hydrodynamic (produced by swimmers) and buoyant torque around the transverse axis. Ten swimmers performed 50 m front crawl and backstroke at four selected velocities (same velocities for both techniques). All trials were recorded by four underwater and two above-water cameras to collect data for three-dimensional whole-body motion during one stroke cycle (defined as a period between two consecutive wrist entries to the water). The inverse dynamics approach was applied to obtain buoyant and hydrodynamic torque around the transverse axis. The differences between front crawl and backstroke techniques across four levels of velocity were assessed with a two-way repeated-measures ANOVA. There was a main effect of technique on the mean buoyant and hydrodynamic torque, with 30-40 % larger leg-raising buoyant torque and leg sinking hydrodynamic torque in front crawl than in backstroke (p ≤ 0.001). The time-series data revealed that the hydrodynamic leg-sinking torque had its peaks during the first half of the underwater upper-limb motion in front crawl, but that was not observed in backstroke, implying that the strategy of counterbalancing the buoyant torque is different between the techniques.

Item Type:Article
ISSN:1476-3141
Uncontrolled Keywords:Alternating techniques ; aquatic locomotion ; buoyant torque ; inverse dynamics
Group:Faculty of Health & Social Sciences
ID Code:36259
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:16 Nov 2021 12:06
Last Modified:16 Nov 2021 12:26

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